Thebes vs Theban

Thebes and Theban both are nouns.

Word	Noun	Adjective	Verb	Adverb
Thebes	Yes	No	No	No
Theban	Yes	Yes	No	No

Thebes (noun)	Theban (noun)
an ancient Greek city in Boeotia destroyed by Alexander the Great in 336 BC	a Greek inhabitant of ancient Thebes
an ancient Egyptian city on the Nile River that flourished from the 22nd century BC to the 18th century BC; today the archeological remains include many splendid temples and tombs	an Egyptian inhabitant of ancient Thebes

Thebes (adjective)	Theban (adjective)
	of or relating to the Greek city of Thebes or its people or culture
	of or relating to the Egyptian city of Thebes or its people or culture